Drying apparatus



A. J. KUHN. rying Apparatus.

No. 227,020. Patented April 27,1880.

WITNE ATTORNEYS.

it PETERS: PHOTO-UTNOGRAPHER, WASNINGYON. D c

UNITED STATES PATENT OFFI E.

AUGUSTUS J. KUHN, OF LEWISTOWN, PENNSYLVANIA.

DRYING APPARATUS.

SPECIFICATION formingpart of Letters Patent No. 227,020, dated April 27,1880.

Application filed January 20, 18250. I

To all whom it may concern Be it known that I, AUGUSTUS J. KUHN, of

LeWistown, in the county of Mifflin and State of Pennsylvania, haveinvented a new and useby its peculiar nature, is difficult to dry andinconvenient to handle; but my improved machine may be used to advantagein drying any material that will run through the machine.

The principal objects of my invention are, first, to permit the use ofexhaust-steam for producing the drying-heat; second, to save handling ofthe material from the time it is placed in a wet condition in themachine to its delivery in a dry condition; and, third, to permit theregulation of the feed and delivery according to the heat and conditionof the material and to prevent clogging of the feed.

Figure l is a vertical longitudinal section of my machine. Fig. 2 is avertical transverse section on line a; w of Fig. 1.

Similar letters of reference indicate corresponding parts.

A is the revolving double-walled cylinder, which is to be of suitablelength and diameter, according to the character of the material to beoperated upon, and is supported at each end on rollers a a, that aremounted in suitable bearings in a substantial frame-work, as shown. Thecylinder A may be set with its axis either horizontal or more or lessinclined, to retard or hasten the passage of the material through it, asdesired.

The outer shell, I), and inner shell, 0, of the cylinder are formed ofsheet-metal plates riveted together and to end rings, (1 (1, whereby anannular space is formed around the cylinder, which space is closed atthe ends.

At the delivery end the ring (1 is formed with external gear-teeth, withwhich meshes a pinion driven by suitable power, and to prevent sand fromgetting into the gearing the inner shell, o, is extended beyond the ring(I, and flares outward in the form of an annular flange, 0.

At the feeding end of the cylinder A is fixed the feed-hopper e, thebottom of which is of semicircular form, and extends a short distancewithin the cylinder through an apertured plate or ring, I), which isattached on the end of the cylinder, and serves to prevent the materialfrom escaping backward after entering the cylinder. One side of thehopper c is partially removed to give opportunity for dumping in thesand or other material.

The steam-pipe is made in two sections. The inlet-pipeg is at thedelivery end of the cylinder supported at its outer end in a fixedboxing, h, that is fitted with a packing-gland, f, around the pipe, andto which boxing is connected the curved coupling *5, that receives anexhaust-steam pipe. The pipe 9 extends a short distance within thecylinder A, and terminates in a hollow box, 70, that is fitted withradial tubes l, preferably four in number, e11- tering the space betweenthe shells b c. The tubes 1 are threaded at their outer ends to receivethe nuts 1, that are screwed against the -inner surface of the shell 0,so that box and tube g are firmly held in place and may be accuratelycentered.

The outlet steam-pipe m at the feed end of the cylinder is similar inconstruction and arrangement. Its inner end is connected with asteam-box,n, from which radial tubes 0 pass to the annular space aroundcylinder A, and its outer end enters the boxing p and is packed by agland. A pipe, g, from the boxing p carries off the steam. Theoutlet-pipe m extends through the center of hopper e, and is fitted witha spiral flange, m, by which the material is carried from the hopper 6into the dryingcylinder. The material therefore is subjected to heat assoon as it is placed in the hopper, and the flange or blade m, beinghot, dries the sand in contact with it, so that clogging by the wetmaterial is prevented.

The inner surface of the cylinder A is fitted with four (more or less)projecting flanges, r, arranged spirally to agitate the material andcarry it to the delivery end of the cylinder. The flanges 0" will bearranged at the pitch required for carrying the material forward at therequired speed, which may be accelerated or retarded by raising orlowering the feeding end of the cylinder or by varying the speed ofrotation.

I provide for using live steam directly from a boiler in case theexhaust-steam is not sufficient, or when the other machinery is not inuse, by fitting a small steam -pipe, 8, to the curved coupling t', saidpipe passing a short distance beyond the outer end of inlet-pipe 9, sothat the live steam will enter beyond the joint in the box, and will actto draw in the exhaust-steam.

In operation, the steam passes from pipe g to the jacketed space aroundthe cylinder and out by the pipe on, thereby keeping the cylinder inaheated condition. The Wet sand from the washing-machines is dumped intothe feedhopper e, and from thence is carried by the blade m into thecylinder, and runs out in a dry condition from the delivery end into anysuitable receptacle.

A cock, t, in the outer shell of the cylinder permits escape of Water ofcondensation from the jacketed space of the cylinder.

This machine will perform the drying more rapidly and conveniently andat a less expense than the drying-floors usually employed. The machineusing exhaust-steam, the expense for fuel will be little or nothing, asother machinery requiring power is generally used with the drier.

Having thus fully described my invention, I claim as new and desire tosecure by Letters Patent- 1. In a drying apparatus, the hollow box 70,with its means of discharge, and the pipe g, with its stuffing-box, incombination with the live-steam and exhaust pipes as and for the purposespecified.

2, The combination, with the annular chamber between shells b c, of thebox a, having radial tubes 0, extending into the sand-chamber, and thespirally-flanged pipe m, passing through the hopper to the inlet, as andfor the purpose specified.

3. 1n drying-machines, the combination-,with the revolving cylinder andinlet-pipe for exhaust-steam, of the pipe 8 for live steam, connectedwith the coupling and passing through the boxing of the revolvingsteam-pipe, substantially as shown and described.

AUGUSTUS J ULIOUS KUHN.

Witnesses:

J N. B. SELHEIMER, J. B. L. MARKS.

